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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee90de71837ce16678e54cd726f095186676348b6e0dbcb08d30480e77a4ade' 
  AND token = 'f2PdIxgzM9XIgO0qnGdxghMhxgof8r/2Z/xJiplsfuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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