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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1530c0358e0b04573fdf71f6fcf8714af2b429acd289b5fd12f780ed07ce4316' 
  AND token = 'vXdNS9xYrBPzrZKiIg9o84/PuxZ7XTQT1PS75WvowgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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