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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82c99303746fa60f9c2d72dd763fc3b30b433557023cbe3e7a029820d069a56' 
  AND token = 'Dzld/1ytBFxGjGTVlZ08tjaXu+FT1oQyuM4Oam3y/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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