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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdca28a8035f62c1f51b88c3a4dffb00103de426ae82c1e37017105ae07922a4' 
  AND token = 'oKs4CdprlpNnWSS9zvMJ1jDQ2Z3+KacHjOuiwsjWFv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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