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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504f485550206f0e0cd3f71f2e0f0ea54e644d6ac065968aacc6ccfb089694fd' 
  AND token = 'v5TCVx3Q0RirewcGP4gEiMa6+yrkouNyDfLn12l8Zcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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