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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ba4e25d0680a2ee69cc8f477aa2b50a7285530016d14a8f7cc73a495397094' 
  AND token = '+wn2ARQTOvart4JZQ+QueGBf82GbWryqC5fZsIGceco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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