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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84b463378279a8b41a36ecd9ae0918591c7cb8152f92d51e28656595de8d985' 
  AND token = 'vxh2y6jaWHm3U81D8NJMEC8acDu1NeZu3gtwTvtKkNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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