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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165fd95b59cbee41636d99f334f31398915acc8df3ac5a2da1cfc1c0bbb87f5e' 
  AND token = 'faOYcgzIblKeCNZeS27KyskZpq0F8a2MmPrLQEYeVME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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