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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6f8c1d9401e73f339c56fffb94dd7923ed9084adfd282f658eff16a3ed8cdf' 
  AND token = 'O1u4IM9au2Q9Wcxw6/Fu1oUGAS4ICzCQWmnq93frrUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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