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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd999f5d6291f6ee2cb6c0a8c3b43d74f28714a2e383ec40e3433e7b8ed87a6d' 
  AND token = 'Oe8UOSdLyR18eIoOAA789SwupHx7Nuk9azEE2oyzLgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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