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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db908589eb50431073a3af731ea72144b93e57a425ba25c1237c09768c18876f' 
  AND token = 'N92ofcfHtTiSHWqOJab/BkwNxLE8T3I4BseK0bvLXl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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