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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb694ef0051b42de7146093e0a522612301667bf668d7d20760ab39584b577d' 
  AND token = '1uWCd6DZfTC8uhhVia3Jz1mW2foU2LYRZe6YR+o7ZdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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