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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89526b933dadaf17ac80ba3425d4f099ab43ec0d736e17ba048d6d4751aa245a' 
  AND token = 'wxqahLe4qvMqiJ/sajxJQnlmxn3KRF7T66s+V7koz1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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