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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cf2474a4e61b094fac560cf716594627ebbc07ddd587ca9ebd3554a6bf325d' 
  AND token = 'AHpKZNh7yUCAWDHO0eyISO8lF/f3ZOuelR+usbjh3YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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