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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf20620aa8a3cf1ce4f70cdeef412d92910d21fc971f2bd6780918d9dfb4eef5' 
  AND token = 's5leMdTg69DKBai339fXFSD3YWcHNF+BK1Q3eSi18iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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