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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11f882df1d08e39b49c1af2829279207d8f078ddcbbeb1b7b8c17a1fec2011a' 
  AND token = 'A3BUYQltVeO7bHeGmFYBv9hDIuLycI/3MXkfYM4V44I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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