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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751bc46318a96a2a99a50e37bda534b699ece4ef5ef382df92381c64090003d8' 
  AND token = 'jgJaidfhpsFkbUAFolZyI2J7E8ddvxAxlQ1ecqCmpVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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