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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d066ec5113198e24243b42a543efac9b9e71e2ec0cb7e88e4ecbc6269565405' 
  AND token = 'lCerxhdgoxqvqylG/1/zSv1MgS1mtzBJV0gltN+xq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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