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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adc592e9c837fdd13e8ea39f0b7d2f5b044d9df2129e6176c421d6f8d4d70eb' 
  AND token = 'mgBS88TBKEiUKPc5ppIu43NMBODl+cNhVwFAiUT6Ldk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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