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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3b2c3cd962bedf7ccae355d2ffbbd3e95a13c808df6fbb31cc7856306bf9b2' 
  AND token = 'cBrqEi1Zw7LXCKKNvOvwcy8p6MxqIqlN7cCVQ4B2g+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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