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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865135f6f0999ebac216d63e70d2186e9a1661afc01f198877b93a96069eec31' 
  AND token = 'qqBAmdxWc4CuEHr2ve/F5HRDeDC86engt7vUg9v8Nuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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