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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8b39dcd093ca7a489eedc8961de5d4fafaccda229b129816f45c48011eb37d' 
  AND token = '2+fFIFUwK0h0DLJjSHJdAmCqdu2qOLkYjJeSKQsFnNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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