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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257ea53c87211374c7bf6d53f839366ddb42d34bc4c1f505f0b8068ab4869903' 
  AND token = 'h/GfACytxnE3SQ5vlzQXrTzxGA95oiiNvW2i1YTsuKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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