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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df36175e72985f06ac02614732517ea9f5fb449e255f5d929970fd9a5e55be0f' 
  AND token = 'CKzVTslqhKpaWu+n82WrdrzF6C0PSfzOC1S7KICQu3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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