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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab9393b03d91f3f0e7e7d71f8ba9d6d0c0793957fc60d899c47b06fc976b8e4' 
  AND token = 'qoe/CKXxyHEdB+ONUiKyT6H8z+l5SbcqJupW4p1U3mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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