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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9bd3ea35f4ea5bfccb90317537bdb50b14bb71f5372206d40ca752d85fa054' 
  AND token = 'yR8hiYZ9WG3tR5t6mNuksKHk/7XMAx0rjK0uch4kyX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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