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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9488af8d78c549c4564430c09fa03794de979bfe4cdc73a9813f597857fc9767' 
  AND token = 'tmkaP2q7ReSFYLiSqMN4LdR4CK67jXWiA7UJ+G4pq/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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