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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d92f44d6e524af2ae31bb736c893ec2e04e27b93d8b6e8abf785ae5873d517' 
  AND token = 'KSqLGPms96C068EyhP2kbfM4fJsWuHT2mgjrjg15Kb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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