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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c95c938aae42a23448184c54e878721cce4420eb66d81396c645031e94d68d' 
  AND token = 'sT3TNTW/Xz/mYwLFod1UvSU3i59VSwZZ/Q8IvHW8kQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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