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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7e9ad9c98ee20b1b0b5a911eaa2d3de009d83503a081956568b7a029adf731' 
  AND token = 'LZlV6RNAGwYuSU0/ses5xtwAuQt8QlnGrvP67M9ECoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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