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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c818cb786a7e5623f8672c2903ec786c27794394c2e537011e119b2712b40f' 
  AND token = 'cCVq5WwDSDgCl+LqmvQoeekRpJ1Ium85wcU0Dtefl/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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