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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad218236cc859e13401baf13c40d10bb7d987951e84931c470a042f3b221c2b9' 
  AND token = 'saF/D7iD9xsl2xg9IUR2f5fEKoRPmwou6uqNdmujjNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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