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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6715bb43577b1fe0580030f9265b7c940b61074058b92955ec24bd01b134f850' 
  AND token = 'myHKWDaV4mrWJB8/tzBsYeCz4NVt7xP0Qw43W7khzEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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