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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e2c8c44ee7e648096ddf239e1282ed29e64ad42f24e811bae26bea569eaca' 
  AND token = 'rhkdGMd3mb1gEcLzw+sUFparluOmIkkKt+nFDBjy80s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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