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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7afd2892e42b142fe77a87bc5f55014a5ad9b6fd3b60ee9b2738fa80ab95392' 
  AND token = 'zp2rlcMSdaywZhYUruTQK9w29gpl6pLj3iTjKGhOe6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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