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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56537ca08d0a1114eeb104df328172bb670fb8600d76c5ae772ea7f61fed893e' 
  AND token = 'BFml8MSEG76RXmhB5nznSy6JUeEFEpwZAqZCiC//M1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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