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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cc00cc5b802218891456a3b897368887339b820337dcbf6848b8e0f2e80211' 
  AND token = 'wJJjwOswkn6Y/fadFwXzoliTq5C21AUTRM3+Drf9eKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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