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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2fd53a20eafb3f5737406f472311e27bd7e95b4f8f82c66e7d0b40598dffc8' 
  AND token = '/2eO+WoPErYRu9mbqM6V6YgZcMx0f/nyo6ZY4c+g7ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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