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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53cda2064b8d51c95a75a8c3de4a9519ee41a7c5537d9ee63a25ef7e2d9350f' 
  AND token = 'xsaFYkD5NZONTS2b6cTyEm1fLxwf8jM3ibvI5WQ4zbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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