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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be580ad5da689dba8b8476d26869d051a7087dccc8c8db874e385dd55648260' 
  AND token = 'dpe/4G7LMayc2v0v5Fjby00X8u9vnu+8KYLsn6i+jJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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