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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef0bf106e738c934532be7e1cf872f9cdae419c0f98f9bbb5014dcf1d89ca4b' 
  AND token = '7FqRlRTn4Dv89QwEePu4Rtf52+wdc7mqnBk0uN5NEP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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