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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd544e7f52114bd1bc6e87740ff192dc744c7d8d228b7558cf87296c0c5ccf01' 
  AND token = '8XdcDX7E4uXGo3vBubUJK379w+qwe+y/15vCOCeKwEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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