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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cb602da46098a6c5deb8a6af5d59a7e899bc914cbec2760b672c64f55277b2' 
  AND token = 'A80QqrJHkMwpXbYGeFPJz3x2LTIaqaAB8uA24iP2CNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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