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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962b36e5ca8a6333da90884d02eee59ba86bdcb8e2063134335639bcf1864447' 
  AND token = '2L8B0nbTL8KecEajPsACVHHi7CzfM+OsfmP+asJal3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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