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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11b226460f2a1a93b0fcbd9cae6eb4c06c808f4a7e92a9ef94a66048dd0605c' 
  AND token = 'Jsf4q6jdDrJQM8JnHFdYlcLZROtLYFFgtmVSe0IVuyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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