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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736f51e5ccc2508ecc48f44cbc628dc05149007314dab10cdb5dbe1e9634d4b0' 
  AND token = 'ZvsxNNPHVYWISa2nNXnAAJ6H3C/snb6Pp3372srN8nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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