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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8013ba9a5b316f6b8153c78f8945b0144341ea564f725a2451e8a3b12ecb4871' 
  AND token = 'g63AGrpgxr/aDM28Gh45ra009wZwTb8ec/rcut8pHlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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