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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01478d419b1072a78f45b88b08c21ba2c316f88f8d18dda3ec3c918046c1bc4' 
  AND token = 'Mz5JFiSVFvP4ddi+A/owt0m0adbceqjWvAM53klVR/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}