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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a812bceabc4dba611594577632784bad00c182ec53aa37fa424965f61afcf99f' 
  AND token = 'Tl2dVLhxVK7p/zo44YObU1EnZ5oRLIj7sbfPrU06hG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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