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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3a9caa649428e5b48c19dd3954edfc3f76dafa1038bc16cef5e7efea2db3bf' 
  AND token = 'yVFeDRfLBVzF8JjwkILGWZ3/vj7M860SKvy6acbpfuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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