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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c401e00b64ddaedf2d11a1999e80c91b18a1ac5b5a06a4f7f6fb720fea38df8' 
  AND token = 'fmm9zb75NnP3l6vCKs1Nsu8J6X5rm3IwP5RUN/pIvnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00214

JSON explain

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