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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcd54bdc0fac625f90f9cf4e1ebaab82acb0e61a21acd9f3143bafbc1d9cf80' 
  AND token = 'j2NLe2PqsUHtqfQmWm9YPledQSQGgh4eOtB5SLd3Inw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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