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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab16deae1e2443fd9a0dff0bd898d4e93be9143d470292a18f594fd7c1b1f7f' 
  AND token = 'eyBdL+ia9Sx+f2LfW7cqXH7mc3BYXYv9zm8jWLZB+9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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