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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5827bf0caca66cc6392ef4cf6b5e79770e93896c4cc6b5ef78a347e3983f4785' 
  AND token = 'b36XmGDeVNN1fINaKeJwHDGy7ivvUtAc5QXqZ5BSHEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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