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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc042be9aac6929d43ee4ee1708ae9b7157973097a2030ba5fc025e9bae597a3' 
  AND token = 'XiPclbAD30+V2II3Zn2gU3i614o/z2Ko6xwhrsKGXKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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