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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bace0d1fe81f9e4e94499672c1e6b12297c11d898e761fc72572a6f89013eed' 
  AND token = 'b++mtaSJCTJNlZ/DtY9LFCn8d74rh/6jnd3x+xJe6Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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