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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e884b028ffd92f8a7bd2ceacb9f2188f264a1d9b2cde4f41e3cc67b0750aa0' 
  AND token = '5Gl4CuE+SE3R7iCIPP9hOX1YU1n0r83MO6mG7Buh/O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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