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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037047c4d014700745272dec80680fd2d76516fa60b66523725d6316993fdc1d' 
  AND token = 'MinYnDQlSooTlD1d2T/ikmcK4dFuOYt5nTBJ2PAV+gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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