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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9037077e17d4e3fb19dc517933f45c6d96c2f6a359acb3ef2140515331507094' 
  AND token = 'jhN7/Yy+y4FZC/9OvlryFIBptmMxEMZRt1mLe2HUS4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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